Rolling-drum plow.



W. B. PRUGH.

ROLLING DRUM PLOW.

APPLICATION FILED 001". so, 1911.

Patented Nov. 25, 1913.

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ROLLING DRUM PLOW.

APPLIOATION FILED 001'. so, 1911.

Patented Nov. 1913.

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ROLLING DRUM PLOW.

APPLIQATION FILED 001230, 1911.

Patented Nov. 25, 1913.

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I/I/ITNESSES.

UNITED STATES PATENT OFFICE.

WALTER ZB. raven, or SINKIN, MISSOURI, AssIsNoR '10 PETER GRAVERT, or BENSON.

NEBRASKA. Y

ROLLING-DRUM PLdW.

Specification of Letters Patent.

Patented Nov. 25, 1913.

Application filed October-30, 1911. Serial No. $57,418.

To all whom it may concern:

Be it known that I, WALTER B. PRUGH, of Sinkin, in Shannon county, Missouri, have invented certain new and useful Improve- .ments in Rolling-Drum. Plows, which immotor, rolls upon the ground that is being plowed.

In the operation of plows of this kind, as

commonly constructed before this invention was made, the rolling drum, whenever it is steered aside from a straight course, and while in the act of turning, necessarily slides more or less upon the subjacent soil-- a movement which involves considerable expenditure of power, especially when resisted by the hold of the drum teeth 1n the soil. To avoid unnecessary expenditure of.

power in a movement of this kind, as well as to modify and diminish the movement it self, is one of the objects of the invention.

Another object of the invention is to adapt a plow of this class to work easily to various depths, as may be required in different soils and situations.

Yet another object of the invention is to able to their own curvature, for the purpose of assimilating their movements in all operative positions of adjustment.

To accomplish these objects I incorporate inmy improved plow a drum consisting of a pair of independently turning rollers,

means for driving these rollers differentially,-

tooth-carrying lever arms pivoted within the rollers, and means for thereby adjusting the teeth to penetrate the soil little'or' much or not at all as may be required.

The best manner in which I have contemplated applying the principles of the invention, is shown in said-drawings;but, as

many changes can be made in the construcgworm 17 affixed to the hub being squared at one end and located inan' accessible position at the outer end of the tion of the plow, and many apparently different embodiments of these principles can be produced, without departing from the scope or spirit of the invention, it is intended that all matters contained in the followlng description, or shown in these drawings, shall be interpreted as illustrative, and not in a limitin sense.

Figure 1 of t e drawings is a side elevation of a plow which is constructed in accordance with these princidples and has its drum teeth fully protrude for deep plowlng. From this elevation,

however, a part of the contents of the drum is omitted for the sake of clearness. Fig. 2 is a plan of the same plow-with its retractile teeth in the same extended position. Fig. 3 is a vertical cross section on the sect-ion line OO in Fig. 2. Fig. 4 is an axial section of an end portion of one of the drum rollers.

The divided drum of this plow comprises two duplicate hollow rollers, preferably of iron, denoted'by the numeral 1. These rollers,"having terminal heads, or spiders 2, and hubs 3, and being provided with terminal circular racks 4 for engagement with driving and driven pinions, are independently rotatable on the transver'seaxle 5, whichis held by brackets or hangers 6 of the plow frame, 7. This frame, which may be of any preferred construction, is shown as consisting of iron beams having parallel horizontal portions at opposite ends of the drum,

a transverse connecting portion behind the drum, and converging united portions in front of the drum. It carries, in advance of the drum, a platform 8, upon which is mounted a gas engine, or other suitable mo- .tor, 9, for operating the machine.

Each of the rollers 1 is armed with numerous retractile teeth 10, protrusive through suitable holes in its cylindrical wall. Within the roller its teeth are firmly mounted on the arms 11 pivoted in the lugs 12; and these arms being arranged in circular groups, as illustrated in Fig, 3, are connected by the links 13 with the radial arms 32 of'the series of contiguous hubs 14 rotatable on the axle 5. So many of these hubs as occupy each of the rollers 1- ..,re fastened by the bolts 15 to the gear 16 which is rotatable on that axle and meshes with the 3. This worm,

free ends pointing forward in the direction in which they move in plowing, and are curved in approximate conformlt-y wlth the circular arcs in which they move while he- 'ing adjusted as described. Preferably each of these arcs has its radius approximately equal to one third that of the roller. Consequently' these teeth, whether adjusted to form predetermined angle,mov1nglong1tuprotrude from therol ler much or little, invariably enter the soil at a practically unidinally in the direction of their ,own curyature and of their curate cycloidal orblts,

and hence are"driven into the soil with minimum resistance.

The gearing by which the power of the motor is applied to the rollers 1, comprises f the pinion 18, keyed on the rotary driving shaft 19,'the gear 20 keyed on the countershaft 21 and meshing with the Pinion 18, the bevel pinion 22 keyed'on that countershaft, a/system of differential gearing 23 driven by the pinion 22', a transverse shaft comprising two alining portions 24 driven difierentially', like the rear axle of an automobile, by the differential gearlng 23, two

parallel side shafts 25 driven from said shaft portions .24: respectively by intermediate beveled gears 26, and beveled pinions 27, the latter being keyed on shafts 25 and meshing with the racks 4: respectively.

'On a transverse shaft 28, which is mounted behind the drum and is driven from one of the racks 4 by intermediate gearing 29, is carried a rotary pulverizer 30, having nu- .merous radiating arms 31, which strike rapidly between the adjacent circumferential rows of the rolle'r teeth 10.

The wheels 33' which carry the front end of the plow frame are steered by the handwheel 34 turning the axle 35 of those wheels "through the intermediate chains 36, drums 37, drum-shaft 38, gear 39, worm 40. and

wormshaft 41. H Iwish it understood that my invention is not.limited to any specific construction or arrangementjof the parts except in so far as.

. limitations, are specified in the claims.

I claim as my invention a LA rolling-drum plow comprising a hollow power-driven roller having a plurality of tooth-holes through its cylindrical wall, a plurality oflever arms pivoted to the inside of said wall in advance of the tooth-holes respectively, a pluralityzof curved teeth carried by the lever arms and adjustable endwise thereby through thetooth-holes respec-:

vance of the tooth-holes respectively, teeth.

having a curvature substantially concentric with their respective arm pivots and mounted on the lever arms to move endwise into thehollow interior of the roller and outward in the tooth-holes respectively in the direction of their own curvature and approximately in the direction of the curvature of their own orbits at the surface of the ground, hubs rotarily adjustable on the roller axle, links connecting the hubs to the lever arms respectively, and gearing for adjusting the hubs on the axle.

3. A rolling-drum plow comprising a hollow traction roller 1 having tooth-holes through its peripheral wall, a plurality of lever arms pivoted within the roller in advance of the tooth-holes respectively a plurality of curved teeth mounted on the pivoted arms respectively and movable endwise thereby into the hollow interior of the traction roller and outward in the tooth-holes respectively the curvature of the teeth being substantially concentric with their respective arm pivots, a plurality of hubs bolted together on the roller axle, links connecting the hubs to the lever arms respectively, and means for adjusting the hubs rotarily on the axle.

I 4. A rolling-drum plow, comprising a hollow roller having circumferential rows of tooth-holes through its peripheral wall, a plurality of lever arms approximately equal inlength to one third the radius of the roller, arranged in circular groups within the roller and pivoted approximately in the loo rim thereof in advance of the tooth-holes respectively, a plurality of teeth carried by .the lever arms respectively, curved circularly aroundtheir pivotal centers and registering with the tooth-holes respectively, and means for adjusting the lever arms in unison;.the curvature of the teeth and of their pivotal movements being substantially identical with the cycloidal curvature of their movements while entering the soil.

'5. A machine of the described class, comprising a hollow power-driven roller havlng tooth-holes through its peripheral wall, a

plurality of leverarms pivoted in advance of'the tooth-holes within the roller and near said wall, a plurality of curved teeth mounted on thefree ends of the lever arms respectively'and movable endwise thereby in the direction of their curvature into the hollow interior of the roller and outward in the tooth-holes, the curvature of the teethand of their pivotal-movements being substan-- tially concentric and substantially identical with the curvature of their movements into the soil, means mounted within the roller for rotary movements relative thereto, links copies of this patent maybe obtained for five cents each, by addressing the Washington, 20.0."

connecting said means with the pivoted arms, and mechanism for imparting predetermined rotary movements to said means 15 to communicate through the links unitary oscillating movements to the arms.

In testimony whereof I hereunto su-bscribe my name in the presence of two wit- Commissioner of Patents, 

